What is the correct order of taxonomic categories from bottom to top?

Correct answer: Species → Genus → Family → Order → Class → Phylum → Kingdom

Direct answer: A. From the smallest and most specific category upward, the usual taxonomic order is Species, Genus, Family, Order, Class, Phylum, and Kingdom. Each step upward includes a broader group of organisms. For example, several related species form a genus, related genera form a family, related families form an order, and so on. B is incorrect because it places Family before Genus; genus must come immediately above species. C is incorrect because it reverses Species and Genus at the beginning. D is incorrect because it places Order before Family; family must come before order in the upward sequence. A useful memory line is “Small Girls Find Our Class Pretty Kind,” representing Species, Genus, Family, Order, Class, Phylum, Kingdom. In some classifications, additional ranks may be inserted, but the sequence tested here is the standard school-level hierarchy. Moving upward means less similarity and a wider group.